Sand-mill.



G. MOWRY.

SAND MILL. APPLICATION FILED MAR. 18. 1910.

1,005,738. 1 Patented 001;. 1o, 1911.

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G. MOWRY.

SANDMILL;

APPLIoATmN FILED MAR. 1s. 1910.

Patented Oct. 10, 1911.

2 SHEETS-SHEET 2.

GEORGE MOWRY, OF DERBY, PENNSYLVANIA.

SAND-MILL.

Speccation of Letters Patent.

Patented 0ct. 10, 1911.

Application filed March 18, 1910. Serial No. 550,140.

To all whom it may concarnf Be it lmown that I, GEORGE MowRY, a citizenof the United States, residing at Derry, in the county of Westmorelandand State of Pennsylvania, have invented new and useful Improvements inSand-Mills, of which the following is a specification.

The invention relates to an improvement tions being so formed `as topermit the use of the weights at the most eEective point withoutinterfering with the usual operation of the mill.

rEhe invention in its preferred details of construction will bedescribed in the following specification, reference being hadparticularly to the accompanying drawings, in which Figure 1 is avertical, sectional view showing a sand mill of ordinary type providedwith my improved weights. Fig. 2 is a section through the weightsections. Fig. 3 is a vertical section through the lowermost weightsection. Fig. 4 is a similar view taken at right angles to Fig. 3. Fig.5 is a vertical section through a mill taken at right angles to the lineof section of Fig. 1. Fig. 6 is a plan of the mill, the upright shaftbeing in section and the parts above the weight omitted.

Referring particularly to the accompanying drawings, I shall rstdescribe the specific details of the mill, wishing it to be understoodthat such is a commercial type of mill and is designed for theconventional representation of any preferred type.

As will be understood, the mill is designed for grinding rock and thelike delivered thereto into fine sand particles and in its essentialdetails of construction comprises a frame structure 1 in which issupported a pan 2 having an inlet and an outlet through the former ofwhich the rock or similar material is delivered preferably by a streamAof water from a pressure and from the latter of which a differentmaterial is delivered by the current. Mounted in the bearings in thebottom of the frame and extending vertically therefrom is a drive shaft3 which, at a point above the pan, is formed with an enlargedrectangular section 4 above which section the shaft is gradually taperedand provided on its upper end with a gear to mesh with a gear mounted onan operating shaft, whereby a rotary movement is imparted to the driveshaft. The rectangular section 4 of the drive shaft is formed with anelongated centrally disposed channel 5 in which is mounted a casting 6,preferably rectangular so as to be guided in movement by the walls ofthe channel. The

casting extends beyond the walls of the section 4 of the guide shaft fora short distance in its rectangular form, as at 7 then is reduced indimensions and rounded, as at 8. A wheel shaft or axle, as 9, extendsthrough a bore 10 in the casting, and beyond the sec tion 4 of the driveshaft said axle receives the boxes of the crushing wheels 11. Thesewheels operate in the pan 2 traveling in a circular path therein underthe revolution of the drive shaft, as will be obvious. In order toaccommodate the wheels to the different quantities of material whichwill lodge in the pan at different stages of the` crushing operationsaid axle must be capable of an independent vertical movement. This ispermitted by securing a pin 12 through the casting and axle with itsprojecting terminals guided in vertically disposed elongated slots 13formed in the walls of the section 4 of the drive shaft.

The above illustrates a simple type of sand mill which has been foundcommercially practical and, as previously stated, is intended torepresent any specific construction desired for vthis type of machine.

In practice each crushing wheel is provided with a steel tire which, onaccount of the wear, must be frequently renewed and, as will be obvious,the wear of the tire from its original condition to the condition atwhich renewal is necessary will tend to a gradual reduction in theoutput of the mill from a gradual lessening of the crushing effect.

It is the object of the present invention to arrange for the mill aseries of weight sections which may be added thereto as desired, therebycompensating for the wear of the tire and maintain and increase thecrushing power practically identical with that of the mill in itsoriginal condition until the tire has been completely worn. Theimprovement will therefore permit a much longer use of the mill withoutthe renewal of the tires while at the same time insuring an output atall times equal to the output of the mill in its original condition. Theweights must be particularly designed to permit their application to themill structure without dismantling` any of the parts and withoutinterfering with the necessary independent vertical movement of thecrushing wheels. The lowermost or main weight is in the form of a disk14 divided diametrically into two sections 15 and 16. For the purpose ofdescription it will be treated as a solid member, being formed in thesections to permit it to be applied to encircle the drive shaft withoutdisconnection of any of the parts of the mill. The main weight disk iscentrally providedwit-h a rectangular opening 17 having longitudinal andtransverse dimensions slightly exceeding the similar dimensions of thesection 4 of the drive shaft, and on the bottom surface depending fromand in alinement with the end walls of the opening 17 overlying theprojecting portion 7 is formed with a depending web 18 centrally formedat 19 to engage the rounded portion 8 of the casting, the engaging wallof the portion 18 conforming to the casting at the juncture of therectangular and rounded port-ions and partly overlying each, whereby themain weightk member is supported on the casting in a manner to secureits stability in normal horizontal position. The remaining weightmembers 2O are of disk formation each divided into sections. Certain ofthe members superimposed with the main member being centrally formedwith openings 21 of a size to permit the passage of the rectangularsection 4 of the drive shaft therethrough, the remaining members beingformed with openings 22 to receive and permit the passage of the reducedportions of the drive shaft therethrough. Preferably the opening thusformed in the weight, considering the members as an entirety, is ofgradually increasing diameter from the casting upwardly in that portionof the weight formed to compensate for the movement of the rectangularportion of the drive shaft, the remaining lengths of the opening beingpractically of uniform diam.- eter or of slightly decreasing diameter inthe upward direction. The respective sections of the weight members aresecured together by tie rods 23 passing through openings formed in eachtwo adjacent sections, the oints between the sections of one member andthe sections of the next lowermost or uppermost member being arranged inthe usual breakjoint or offset relation so that when any one section issecured upon the underlying section a practically integral circularweight is provided. lt will be further noted that the main weightsection is, by means of the projections engaging a casting, so supportedthat its lower surface beyond the projection is arranged above and inspaced relation to the boxes of the crushing wheels, as at 25, therebyavoiding interference at this point and permitting the usual oiling andother attention necessary to secure the proper lubrication of the wheel.

In the use of the improvement, the main section and additional sectionsare gradually added as the tire of the crushing wheels wear in order tocompensate for the crushing effect of the wheels lost through the wearof the tires. By this means the crushing weight is increasedirrespective of the wear of the tires, and the output of the machineincreased under all conditions. By' the sectional formation of theweights they will be quickly secured in place when disconnecting ordisarranging any of the parts of the machine, it being contemplated ofcourse that any number of weights can be supplied and that theindividual members may be of any weight desired.

Having thus described the invention, what I claim as new, is

1. The combination with a sand mill including a drive shaft, an axlemounted for independent vertical movement with relation to said shaft,wheels on said axle of a weight arranged to encircle the drive shaft andexert pressure on the wheels, said weight being formed with an openinghaving a diameter exceeding that of the drive shaft to permit theindependent vertical movement of the wheels with relation to said shaft,and means for supporting said weight wholly free from contact with thewheels.

2. The combination with a sand mill including a drive shaft, a castingto move vertically in and with relation to said shaft, i

an axle supported in said casting, wheels on said axle, of a weightencircling the drive shaft and bearing on and movable with the casting,and means carried by the weight to engage the casting to support saidweight wholly free from contact with the wheels.

3. The combination with a sand mill including a drive shaft, a castingto move vertically in and with relation to said shaft, an axle extendingthrough the casting, drive wheels supported on said axle, of a weightencircling the drive shaft and bearing on and movable with the casting,said weight including a main section formed with an opening to encirclethe drive shaft and with a depending projection formed member upon andencircling the casting.

4. The combination with a sand mill including a drive shaft, a casting'to move Sil vertically in and with relation to said shaft, an axleextending through the casting, drive wheels supported on said axle, of aweight encircling the drive shaft and bearing on and movable with thecasting, and means carried by the weight and engaging the casting andsupporting the weight wholly free from contact with the wheels, saidweight including a series of members made up of independent sections,and means for connecting the sections of one member to the sections ofthe next lowermost section.

5. A weight for use with sand mills and the like including a series ofindependent members each constructed of a plurality of sections, andmeans for connecting the respective sections of one member to thesections of the adjacent member in break-joint relation, the lowermostmember being formed with a depending projection having a centrallycut-out engaging portion, the respective members being formed with acenter opening to provide a shaft receiving opening when the members areassembled.

6. In a crushing mill, a grinding pan, a vertical shaft disposedcentrally of the grinding pan, bearings for the upper and lower ends ofthe shaft, a channeled box formed on the shaft between its ends, saidbox being provided with vertically disposed Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

slots and having parallel walls, a casting slidable in the box andengaging the walls thereof, a shaft extending through the casting andbox and having its opposite ends disposed on either side thereof, a pinextending through the second shaft and the casting and slidable in thevertical slots of the box, a weight secured around the upper end of thefirst shaft and slidably engaging the box of said shaft and having abearing at its lower end on the second shaft, and grinding rollersmounted on the ends of the second shaft and operating in the grindingpan.

7. In a grinding mill, a vertical drive shaft journaled at its ends, achannel box formed on the shaft between its ends, a casting slidableinthe box, an axle extending through the casting, grinding wheelsjournaled on the axle and movable in the grinding pan, and a weightmounted on the axle and supported out of contact with the drive shaft.

In testimony whereof I afix my signature in presence of two witnesses.

GEORGE MOWRY.

Witnesses:

J. R. CAMPBELL, PHILIP MowRY.

Washington, D. C.

